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【Objective】The study aimed to explore the biological control effect of arbuscular mycorrhizal fungi combined with antagonistic microorganisms on Zanthoxylum bungeanum root rot, and provide theoretical basis for solving the problem of Z. bungeanum root rot.【Method】In this study, arbuscular mycorrhizal (AM) fungi（Rhizophagus irregularis), Penicillium oxalicum HB21-1, and Bacillus subtilis HX11 were inoculated separately or in combination to conduct pot experiments on the control effect of Z. bungeanum root rot, in order to evaluate the control effect of different combinations of treatments, and the infection rate of AM fungi was measured by staining microscopy. Then, the activities of defense enzymes in the root and soil of Z. bungeanum were measured to explore the biological control mechanism.【Result】The incidence rate of Z. bungeanum root rot under the single treatment of pathogenic bacteria was 86.67%, and the incidence rate of root rot under the combined treatment of AM fungi+HB21-1+HX11 was the lowest, 13.33%, and the control effect was 78.89%, followed by the treatment of HB21-1+HX11, AM fungi+HB21-1, and the control effect was 62.78% and 57.12%, respectively. The highest infection rate of AM fungi was 52.22% under the treatment of AM fungi+HB21-1+HX11, while the lowest infection rate was 24.89% under the treatment of AM fungi alone. At 60 d, the SOD and PAL enzyme activities in the roots of Z. bungeanum were the highest under the treatment of AM fungi+HX11, and the POD enzyme activity in the roots of Z. bungeanum was the highest under the treatment of AM fungi+HB21-1. The plant defense enzyme activity showed an upward trend over time. AM fungi and HX11 could significantly increase soil acid phosphatase and urease activities over time, while HB21-1 could significantly increase soil sucrase activity.【Conclusion】The combination of AM fungi+HB21-1+HX11 has a good disease prevention effect on Z. bungeanum root rot, and the combination of these strains resulted in the highest infection rate of AM fungi. Over time, the POD, SOD and PAL enzyme activities in the roots of Z. bungeanum and the soil acid phosphatase and urease activities under the treatment of AM fungi and antagonistic bacteria showed an upward trend. The soil sucrase activity slightly decreased, but all were higher than the pathogen treatment group, indicating that AM fungi, HB21-1 and HX11 can induce varying degrees of increase in plant defense enzyme activity and soil enzyme activity, which has the potential for biological control applications. [ABSTRACT FROM AUTHOR]

【Objective】 The study aimed to explore the influence of landscape pattern characteristics of Ulan Buh flood diversion area for ice prevention in Inner Mongolia of Yellow River.【Method】 Landscape pattern index and buffer zone analysis were used to analyze the changes of the area of different land types and the degree of landscape fragmentation. 【Result】（i） After the flood diversion, the water body and grassland increased within 3 kilometers. With the increase of years, the grassland area showed an increasing trend, and water and grassland gradually replaced the desert. Within 0.3 kilometers from the lake, the water area expanded from 4.14 to 341.37 hm²; Within 2.7-3.0 kilometers from the lake body, the water area developed from zero to 11.07 hm². By 2017, the water area and grassland area increased by 997.83 and 425.88 hm²,construction land for urban and rural residents increased to 161.37 hm².（ii） Sand land and other land area decreased, the further away from the flood diversion area, the smaller the sandy land area. When the distance from the lake was 2.4-3.0 kilometers, the sandy land area remained balanced. By 2017, the sandy land area had decreased by 718.29 hm².（iii） The patch density（PD） and fragrant diversity index（SHDI） of landscape level index showed similar trends with the increase of buffer zone, with the increase of buffer zone, it increased first and then decreased. PD and SHDI increased within the range of 0.3-1.2 kilometers from flood diversion area; Landscape superiority was reduced, the degree of fragmentation was aggravated, patch types became abundant, landscape diversity was improved, but the law of its change weakened within the range of 1.2 to 3.0 kilometers.【Conclusion】The effect of Ulan Buh flood diversion area was relatively obvious on landscape pattern within 1.2 kilometers of the flood diversion area. [ABSTRACT FROM AUTHOR]

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【Objective】The present paper aimed to explore the effect of nitrogen application of Nitraria tangutorum seedlings under drought stress.【Method】This experiment simulated drought stress, sprayed different concentrations of nitrogen fertilizer on Nitraria tangutorum seedlings(0, 6, 36, 60 mmol·L-1), studied root morphological characteristics and endogenous hormones.【Result】（i）Nitrogen addition could promote root elongation and elongation of Nitraria tangutorum under drought stress, when the nitrogen concentration reached 36 mmol·L-1, the fine and small roots increased to the maximum; for medium roots, when the nitrogen concentration reached 60 mmol·L-1, the promotion effect was the best.（ii）Nitrogen addition could increase root surface area, volume and number of root tips of Nitraria tangutorum under drought stress. After nitrogen application, the maximum values of surface area, volume and number of root tips of Nitraria tangutorum were 155.74 cm2, 2.67 cm3 and 2370.00 respectively, 46.80 cm2, 1.03 cm3 and 408.67 more than those without nitrogen application.（iii）Under drought stress, nitrogen addition could promote the synthesis of IAA, ABA and GA3. Analysis of variance showed that nitrogen had no significant effect on IAA（P>0.05）; nitrogen promoted ABA and GA3 significantly（P<0.05）.（iv）The correlation analysis of root morphological indexes and endogenous hormones of Nitraria tangutorum showed that the correlation among these indexes was not strong, and only individual indexes showed significant correlation. 【Conclusion】In a word, nitrogen addition could improve the drought resistance of Nitraria tangutorum from root and endogenous hormones, but not the higher the concentration of nitrogen, the better the growth of Nitraria tangutorum. [ABSTRACT FROM AUTHOR]

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[Objective]To provide a theoretical basis for sugarcane planting and agricultural development in Guangxi, the soil hydrothermal condition of sugarcane field under different tillage and straw mulching treatments was discussed to select the suitable manner. [Method]The soil moisture and temperature at 5,20 and 40 cm depths under different conditions were monitored. Smash-ridging tillage with no straw mulching treatment(T0), no-tillage with no straw mulching treatment(NTO), smash-ridging tillage with straw mulching treatment(TS)and no-tillage with straw mulching treatment(NTS)were studied at the Lijian research base of Nanning, Guangxi Academy of Agricultural Sciences. The changes of soil hydrothermal were analyzed. [Result]Straw mulching treatment(TS and NTS)significantly reduced the soil temperature compared with the uncovered(TO and NT0)(P<0.05, the same as below)and the soil temperature variation was smaller. Compared with no-tillage, smash-ridging tillage increased the conduction ability of soil heat energy, and it also had a warming effect to the soils after the air temperature decline. Both smash-ridging tillage and straw mulching significantly improved the soil water that the soil moisture content of the TO treatment increased by 31.3 % after the test. The TS was 11.3% higher than NTS and TO was 2.0% higher than NTO, respectively. Also, TS was 5.7 % higher than TO and NTS was 15.4 % higher than NTO, all the different levels above were significant. Meanwhile the soil moisture of the lower layer can be supplied to the upper layer in the smash-tillage. [Conclusion]Both smash-tillage and straw mulching can effectively adjust soil temperature and improve soil water contents. The treatment of smash-ridging with straw mulching can be used as a reference for sugarcane planting in Guangxi. [ABSTRACT FROM AUTHOR]

【Objective】 The aim of this paper was to reveal the ecological risk of heavy metals in farmland soil in Liping County of Qiandongnan prefecture, and provide scientific basis for safe production of crops and prevention and control of heavy metal pollution in farmland soil.【Method】 The single factor pollution index, Nemero comprehensive pollution index and Hankanson potential ecological risk index method were used to analyze pollution degree of chromium(Cr), lead(Pb), cadmium(Cd), arsenic(As) and mercury(Hg) in cultivated soil in Liping County, and their potential ecological risks were evaluated as well.【Results】The average concentrations of Cr, Pb, Cd, As and Hg in the soils were 68.39, 23.55, 0.22, 6.16, 0.15 mg/kg, respectively. Hg concentration was 1.36 times as the background value of soil in Guizhou province. The average single factor pollution index of Cr, Pb, Cd, As and Hg were 0.74, 0.47, 0.31, 0.19 and 0.09, respectively. The over standard rates of Cd was 3.4 %. The mean value of Nemerow integrated pollution index was 0.68, indicating that there was no pollution in Liping county. The low, medium and heavier potential ecological risk levels of Cd accounted for 91.5 %, 6.8 % and 1.7 % respectively. The low and medium potential ecological risk levels of Hg accounted for 95.9 % and 4.1 % respectively. 【Conclusion】There is no potential ecological risk for heavy metals in cultivated soils in Liping county. However, there is still existence of ecological risk for relative heavy Cd level and moderate Hg level in some villages and towns. [ABSTRACT FROM AUTHOR]

【Objective】 To provide a theoretical basis for the development and utilization of rock-inhabiting fungi resources in Shilin rocky desertification area and explore the weathering and mineralization of carbonaceous by rock-inhabiting fungi.【Method】 The PDA and MEA medium were used to separate and purify the rock-inhabiting fungi from 40 rock samples collected from the Shilin rocky desertification area. The morphology of the isolated rock-inhabiting fungi was observed and the rDNA-ITS sequence homology was analyzed. 【Result】 A total of 68 rock-inhabiting fungi were isolated from 40 rock samples, belonging to 2 phylum, 5 classes, 7 orders, 8 families, 8 genera and 12 species. Among them, 31 strains of Fusarium, 9 strains of Chaetomium, 7 strains of Aspergillus, 6 strains of Botryosphaeria, 5 strains of Penicillium, 4 strains of Sordaria, 3 strains of Mucor, and 3 strains of Mortierella Coemans. Fusarium, Chaetomium, and Aspergillus had high relative separation rates, which were 45.58 %, 13.23 %, and 10.29 %, respectively. 【Conclusion】 The Shannon-Weiner diversity index of the rock-inhabiting fungi was 2.41922. The diversity of rock-inhabiting fungi is rich in Shilin rocky desertification area. [ABSTRACT FROM AUTHOR]

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

【Objective】In order to provide scientific references for fragrant taro planting, reasonable fertilization and improvement of fragrant taro quality, the present paper studied soil profile and nutrient characteristics of fragrant taro. 【Method】Through field soil profile observation and laboratory test, the soil profile characteristics and nutrient content vertical distribution of fragrant taro were studied by SPSS software and Origin software. 【Result】(i) The soil thickness of 6 soil profiles was deep. The depth of the topsoil and the heartsoil was between 65 and101 cm, were all mature soil, the configuration includes the plough layer and plough pan, the redox deposition layer and the maternal layer, the topsoil was affected by artificial farming and forms the plough layer and plough pan, colors are mainly black and brown. The heartsoil was relatively stable, influenced by soil factors, the soil presents orange and red color. The structure respectably presents the obvious iron and manganese film;(ii) The particle composition was mainly composed of granules. The silt content was between 40 % and 67 %. The texture was mainly clay loam, silty loam and loam; The weathering of soil profile is not high, and the degree of weathering decreases with the depth of profile. The nutrients content of the 6 soil profiles decreased as the depth increased.【Conclusion】In the fragrant taro, the soil horizon is deep, the degree of weathering is not high and nutrient elements present the distribution of surface agglomeration. [ABSTRACT FROM AUTHOR]

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

【Objective】In this paper, the spatial variation and spatial distributions of soil nutrient in main areas of fragrant taro planting in Shaoguan were studied to provide scientific references for fragrant taro planting, reasonable fertilization and improvement of fragrant taro quality.【Method】The soil nutrient content, spatial variation and spatial distributions of fragrant taro by SPSS software, semivariance of GS + and geostatistics of GIS were studied.【Result】( i) The mean contents of organic matter( OM), available N( AN), available P( AP), available K( AK) of fragrant taro were 2. 98 %, 109. 79 mg/kg, 40. 30 mg/kg, 81. 60 mg/kg, ranging of 0. 89 %-6. 65 %, 27. 79-257. 25 mg/kg, 5. 79-108. 44 mg/kg, 15. 03-270. 18 mg/kg, and variable coefficient were 35. 2 %, 46 %, 64. 7 %, 62. 4 %. There were the differences of soil nutrient contents in different towns.( ii) The nugget coefficients of soil nutrients in towns were AK( 49. 98 %) > OM( 47. 8 %) > AN( 37. 6 %) > AP( 32. 5 %), mainly between 30 % and 50 %, all belonged to moderate spatial dependence, the spatial variabilities of the nutrients were affected by structural and random factors synchronously, structural variation was the main, and random variation was second. 【Conclusion】Overall, the AP contents of soil was abundant, the OM and AN contents were at medium level, the AK was a lack of level, and soil nutrient generally presented a trend of low in the north and high in the southern. [ABSTRACT FROM AUTHOR]

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Nitrogen fertilizer can play an important role in minimizing soil erosion and improving soil quality，so, it is necessary to reveal the effects of nitrogen forms on soil quality. A field experiment with randomized design ]as conducted to study the effects of different forms，including NO3--N，NH4+-N and amide-N，on soil microbial biomass carbon，active soil microbial biomass，soil respiration rate and quotient and soil enzyme activities in the field of sweet potato. The result showed that the soil microbial biomass carbon，active soil microbial biomass ，soil respiration rate and quotient and soil enzyme activities responded differently to nitrogen forms. Soil microbial biomass carbon was the highest in NH4+-N treatment at the early and middle storage root development，and the highest in NO3--N treatment at the late growth stage. Active soil microbial biomass was the highest in NH4+-N treatment at the whole growth period. The soil respiration rate and quotient， activity of urease and invertase were the highest in amide-N. Based on the comprehensive analysis，ammonia could improve soil microbial biomass carbon and active soil microbial biomass，and proper ammonia was the better fertilizer management in enhancing soil biological health. [ABSTRACT FROM AUTHOR]

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Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Taken Xushu22 as tested materials, the field experiments in the Xuhuai region were conducted to study the effects of different nitrogen applications on the yield and nitrogen utilization of sweetpotato for guiding the nitrogen management practices. The results showed that: The yield and nitrogen accumulation amount significantly increased with the increase of nitrogen levels when nitrogen application rates ranged from 45 to 90 kg/hm2, and there were no significant difference in nitrogen recovery efficiency and efficiency for the production of storage roots; While the yield and nitrogen use efficiency were decreased when nitrogen rate was over 135 kg/hm2. The equation between yield of storage root and nitrogen application rate was established: y =- 0. 006x2+ 0. 0943 x + 28. 879, R2= 0. 7793. The study suggested that the optimum nitrogen rate was 78. 58 kg/hm2. [ABSTRACT FROM AUTHOR]

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Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)